Dynamo-electric machine.



E. B. CUTTEN.

DYNAMO ELECTRIC MACHINE. APPLICATION man sEPLz, 1913.

Patented Apr. 27, 1915.

Hill

To all cvhomft may concern ELrsHA n. cUTTEN, oi'EnIE, PENNSYLVANIA, AssIGNonV or THREE-romans To f triiiTEn sTATEs HoEsE sHoEco., or ERIE, PENNSYLVANIA, A conPoEATroN or -rENNsyLvANIA DYNAMaELEcTnIc MACHINE.

Application led Septemberi27, 1918. Serial No. 792,118.

Be it known that I, 'Emana B. CU'i'rEN, a citizen o f the United States, residing "at Erie, county of Erie, State of Pennsylvania, hayeiinvent'ed certain new anduseful Improvements in Dynamo-Electric Machines; and I do hereby declare the following to be a full, clear, and exact description of the `inventiomsuch as will enable, others skilled inthe art to'which it appertains to make and use the same. f

The invention relates to a novel form of .laminated core for'dynamo electric. machines .and vthe method of making the same, and has fo'r its object t'oy produce and provide a magnetic corefor use in yelectric generators and motors, whih'will admit of the machines operated either by director alternat- '1ng current, witha minimum loss due to -eddy currents, hysteresis andother similar objectionable heating effects, which heretofore have been regarded as inherent m electrical machines involving amagnetc core or cores which are subject to the inductive e'ect of adjacent coils orr current-carrying conductors.

. Two simple forms of application of the invention are illustrated in the accompany'- ing drawings, in which l thin. filament of soft iron, preferably in the Figure'jl is a sideelevation, partly in section,` of a motor or generator armature involving 4the invention. Fig. 2 is-an elevation and edge view of one of the .armas ture laminas. Fig. 3 illustrates the mode of forming the armature laminas. Fig. 4 is an elevation of one of the ield core lamin. Fig. 5 is a vertical section therethro/ugh. Fig. 6 isa fragmentary lan view of a pref ferred form of strip or ribbon of which the individual lamin (if the armature core are constructed.

vThe vmethod of forming thev individual lamin, whetherthe same be intended for the armature core or thel field corelof 'a motor or generator, consists in winding a form of a narrow flat ribbon m, continuous convolutions, upon a suitable base, until a flat disk-like element is producedhaving the ribbons" 0 which 'llldiv'idual lamin' -are desired contour, or configuration. In order to inten'u t the electrical continuity of the formed, for the purpose of preventing in-` duced currents which are generated in the armature corek and which flow uninterruptedl in the old forms of sheet laminas, the rib ons employed in building up the armature core laminas are preferably slitted along each 'edge by narrow incisions running inwardly from the edges and preferably at 4right angles thereto, and extending through the body of the ribbon, but only part way acrossthe same. Preferably, these slits or incisions on opposite edges of the ribbon are arranged in staggered relationV so that the solid material ofthe ribbon, as' defined by the slits or incisions', is of sinuous form with the siiccessive portions thereof 'separated by the slits, such as y, along one edge andthe slits z on the other edge, as illustrated in Figs. 3 and 6. These slits are referably formed in the ribbon before the atter isv wound on the-form to build up the individual laminas.

As a matter of conveniencesmd economy,`

however, it is preferable that the ribbon be preliminarily slitted before it is wound to appropriate form to build up the lamin.

In constructing a core for a motor or generator armature, suchas illustrated in F igt 1, the body portion 8 of the core consists of a series of laminae- 10, each of, which is1 mounted upon a central bushing or sleeve 11 of non-magnetic material, the laminae being arranged in juXta-position on the shaft 6 and held securely thereon by means of end plates 9, the core being locked to the. shaft by a suitable spline connection several between said Shaft and the rings or bushings '11 of the individual lamin. The

larmature coils 14 are-applied to the corein any ysuitable manner, and 'the'ends of said coils are connected to the proper segments of the commutator 7. IThe method o forming the` individual armature core laminas, vas illustrated in Fig.. 3, consists 1n winding- ',tlie slitted ilamentary ribbon of soft ironr in continuous superposed convolutions upona I The construction of the individual laminae from the, ilamentary iron in the form of narrow ribbons, and the interruption of the continuity of the ribbons by the staggered slits or incisions, largely prevents the formationA of induced or eddy currents in theB armature core and therefore eliminates in a large measure a serlous defect 1n machines of this character due to the heating of the armature core, which -could not be avoided j heretofore even in cases wherein the core was formed of uninterrupted sheet laminas.

As heretofore indicated, the invention is applicable to magnetic coresof other types and forms of electrical apparatus, such as the magnetic ield cores of dynamo electric generators and motors. l

In Fi s. 4 and 5, there is illustrated -a typical amina, constructed in accordance with the invention, to form the ield core of a dynamo electric generator or motor.- In this case the core of the field magnet is formed of juXta-posed lamin constructed in practically the vsame manner as the lamin forming the hereinbefore described armature core, namely by winding astrip of thin iron ribbon, without .marginal slits, in successive turns or convolutions about a suitable form to produce a general ringlike lamina of the desired form and dimensions.`

The individual laminas thus constructed are assembled in suitable stacks to constitute the desired core and are securely united by suita-v v ble cement and under pressure to produce a substantially solid core of a lield magnet, whichv may be applied to or removed from the machine as an entirety. As indicated,

the several stripsl of ribbon of soft iron are wound on a form to produce the individual laminas, the successive convolutions beingsuperposed and laid adjacent to each other, and as in the case of the armature core, may be separated from each other by a coating of shellac or other suitable cement, if desired.

It/will be particularly noted that in each case, each lamina consists of a series ofy superposed layers or convolutions of narrow ilamentary iron, preferably in the form of a ribbon w, and, in the case of thearnature core, each convolution being interrupted forming each in transversely by a multiplicity of staggered slits or incisions y and 2 extending inwardly from the edges of the ribbon. The convolutions with or without cement or binding material between them, serve to break the continuity of the individual laminas in a radial 1. The method ofmaking laminated cores for electrical apparatus,- whlch conslsts in forming each in ividual lamina of closely wound convolutions of iron ribbon, and assembling a `series of laminas so formed in closely juXta-posed relation.

2. The method of making laminated cores for electrical ap aratus, which consists in 'vidual lamina of closely wound convolutions of slitted iron ribbon, and assembling a series of lamin so .formed in closely juXta-posed relation. i I,

3.. The method of making laminated cores for electrical apparatus, which consists in laterally slitting` iron ribbon forming each individual 'lamina of closely wound convolu tions of vSuch laterally'slitted iron ribbon, and assembling a series of laminae so formed in closely juxta-posed relation.

4. The method of making laminated cores for electrical apparatus, which-v consists' in slitting the opposite edges of iron ribbon in` staggered relation, forming each individual such slitted iron ribbon, and assembling a series of laminas so formed in closely juxtaposed relation.

5. The method of making laminated cores -for electrical apparatus, which consists in laterally slitting ilamentary iron, forming individual laminae of closely wound convolutions of such ilamentary iron, juxta-posing a series of laminas so formed, and uniting the same by pressure and a suitable binding agent.

6. A magnetic core for dynamo.electric machines consisting of a series of contiguous lamin, the individual lamin consisting of closely wound superposed convolutions of iron ribbon. i 7

7. A magnetic core for dynamo electri machines consist' of a series of contiguous lamin, the individual lamin having the form of the cross sectional contour of the core .and consisting of'closely wound superposed convolutions of filamentary iron.

8. A magnetic armature core for dynamo` 1,136,943 l J a 9. A magnetic armature core for dynamo I n testimony whereof I. ax my signature, lectric'. f in presence of two witnesses. yamines, ein vlua ammconsi go "y closely wound superposed eonvolutions of l ELISHA 'B' CUTTEN" 5 iron ribbon'having ite edges provided with Witnesses:

slits, the slits in opposite edges being stagf THOMAS Dumm', gered with relation to each other.V n ELENoR C. SGHUERMANN. 

